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| Open AccessGeneration of third-harmonic spin oscillation from strong spin precession induced by terahertz magnetic near fields
The authors studied HoFeO3 crystal using multicycle THz magnetic pulses enhanced strongly by spiral-shaped microstructure. The observed Faraday ellipticity demonstrates second- and third-order harmonics of the magnetization oscillation and an asymmetric oscillation behavior.
- Zhenya Zhang
- , Fumiya Sekiguchi
- & Hideki Hirori
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Article
| Open AccessEmission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions
Antiferromagnets are promising candidates to build terahertz spintronic devices. However, manipulating and detecting their terahertz spin dynamics remains key challenges. Here, Rongione et al. demonstrate both broadband and narrowband terahertz emission from an antiferromagnet/heavy metal heterostructure using spin-phonon interactions.
- E. Rongione
- , O. Gueckstock
- & R. Lebrun
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Article
| Open AccessReversal of nanomagnets by propagating magnons in ferrimagnetic yttrium iron garnet enabling nonvolatile magnon memory
Spin wave based computing has great promise, offering advantage of low power consumption, aided by the absence of currents and therefore Joule heating. However, the absence of a method of directly storing the information contained in the spin waves represents a significant hurdle. Here, Baumgaertl and Grundler demonstrate the reversal of a nanomagnet via spin waves with small spin wave power requirements.
- Korbinian Baumgaertl
- & Dirk Grundler
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Article
| Open AccessField-linear anomalous Hall effect and Berry curvature induced by spin chirality in the kagome antiferromagnet Mn3Sn
Berry curvature sits at the heart of both the anomalous hall effect and topological hall effect, with the former arising from a momentum space berry curvature, while the latter arises from a real space berry curvature. Here, Li et al present an intriguing example of a combined real and reciprocal space berry curvature in the kagome material Mn3Sn, resulting in a large field linear anomalous Hall effect.
- Xiaokang Li
- , Jahyun Koo
- & Binghai Yan
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Article
| Open AccessThe critical role of ultra-low-energy vibrations in the relaxation dynamics of molecular qubits
Understanding phonon-induced relaxation in molecular qubits is a crucial step in realizing their application potential. Garlatti at al. use a combination of inelastic X-ray scattering and density functional theory to investigate the role of low-energy phonons on spin relaxation of a prototypical molecular qubit.
- E. Garlatti
- , A. Albino
- & S. Carretta
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Article
| Open AccessChirality coupling in topological magnetic textures with multiple magnetochiral parameters
Chiral interactions in magnetic systems enable topologically nontrivial magnetic textures, most notably topological solitons such as skyrmions. Here Volkov et al study the magneto-chiral interactions in a small asymmetric magnetic cap, and show how the geometric asymmetry influence the chiral spin- textures.
- Oleksii M. Volkov
- , Daniel Wolf
- & Denys Makarov
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Article
| Open AccessAnomalous magnetoresistance by breaking ice rule in Bi2Ir2O7/Dy2Ti2O7 heterostructure
Spin ice compounds are typically insulating and introducing carriers can destroy the spin ice state, making integration into electronic devices problematic. Here the authors report a transport response to an ice-rule-breaking transition in a heterostructure of a pyrochlore spin ice and a nonmagnetic metal.
- Han Zhang
- , Chengkun Xing
- & Jian Liu
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Article
| Open AccessDouble dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets
Previous studies of magnetic Bose–Einstein condensates have been limited to magnetic materials with small spin numbers. Here the authors study the magnetic phase diagram of a S = 3/2 quantum antiferromagnet and show a double dome structure that is attributed to different types of condensates.
- Yoshito Watanabe
- , Atsushi Miyake
- & Taka-hisa Arima
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Article
| Open AccessA general thermodynamics-triggered competitive growth model to guide the synthesis of two-dimensional nonlayered materials
2D nonlayered materials exhibit interesting properties for catalysis, nanoelectronics and spintronics applications, but their growth is still challenging. Here, the authors report a theoretical model and an experimental strategy to synthesize various 2D nonlayered transition metal oxides with room-temperature magnetic properties.
- Zijing Zhao
- , Zhi Fang
- & Yanglong Hou
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Article
| Open AccessCreation of chiral interface channels for quantized transport in magnetic topological insulator multilayer heterostructures
Quantum anomalous Hall junctions show great promise for advancing next-generation electronic circuits. Here, the authors demonstrate a scalable method for synthesizing heterostructures of magnetic topological insulators with regions of distinct Chern numbers and characterize the chiral interface modes that emerge at the interface.
- Yi-Fan Zhao
- , Ruoxi Zhang
- & Cui-Zu Chang
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Article
| Open AccessAntiferromagnetism-driven two-dimensional topological nodal-point superconductivity
Magnet/superconductor hybrids have been explored for the realization of topological superconductivity but have mainly focused on ferromagnets with full gaps. Here, the authors find that the antiferromagnet/superconductor heterostructure of monolayer Mn on a Nb(110) surface is a topological nodal-point superconductor.
- Maciej Bazarnik
- , Roberto Lo Conte
- & Roland Wiesendanger
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| Open AccessThe importance of the interface for picosecond spin pumping in antiferromagnet-heavy metal heterostructures
By placing an antiferromagnet next to a heavy metal such as platinum, magnetic excitations in the antiferromagnet drive a spin current in the heavy metal, leading to terahertz emission. Here, Kholid et al study the terahertz emission of two antiferromagnets, KCoF3 and KNiF3 with very different magnon frequencies, and find that the opening of a gap in the magnon density of states drastically alters the spin-transfer efficiency.
- Farhan Nur Kholid
- , Dominik Hamara
- & Chiara Ciccarelli
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Article
| Open AccessBreakdown of the scaling relation of anomalous Hall effect in Kondo lattice ferromagnet USbTe
Kondo systems offer a rich platform to study the interplay between strong correlations and topology. Here the authors observe a large anomalous Hall conductivity in a Kondo ferromagnet USbTe, which they attribute to the Berry curvature originating from flat bands induced by the Kondo hybridization.
- Hasan Siddiquee
- , Christopher Broyles
- & Sheng Ran
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Article
| Open AccessBroadband microwave detection using electron spins in a hybrid diamond-magnet sensor chip
Electron spins in diamond allow magnetometry with high sensitivity, but the bandwidth in the microwave regime is limited to a narrow band around their resonance frequency. Here, the authors solve this problem by coupling the spins to a thin film of yttrium iron garnet, exploiting the non-linear spin-wave dynamics of the magnet.
- Joris J. Carmiggelt
- , Iacopo Bertelli
- & Toeno van der Sar
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Article
| Open AccessCoherence protection of spin qubits in hexagonal boron nitride
Spin defects in 2D hBN are promising for magnetic field sensing but suffer from short spin coherence times. Here the authors extend the coherence time for an ensemble of spins in hBN to 4 microseconds by using a continuous microwave drive and demonstrate qubit control in a protected spin space.
- Andrew J. Ramsay
- , Reza Hekmati
- & Isaac J. Luxmoore
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Article
| Open AccessAccelerating ultrafast magnetization reversal by non-local spin transfer
Under laser illumination it is possible to drive a ferromagnet to lose its magnetization. While this process can be rapid, remagnetization following this is slower, due to the universal critical slowing down near the phase transition. Here, Remy et al show how such a slowing down can be overcome, changing the direction of magnetization in 400 femtoseconds.
- Quentin Remy
- , Julius Hohlfeld
- & Michel Hehn
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Article
| Open AccessEmergence of electric-field-tunable interfacial ferromagnetism in 2D antiferromagnet heterostructures
One particularly useful feature of van der Waals materials is the ability to combine layers of different materials into a single heterostructure, which can have superior properties than any of the constituent materials alone. Here, Cheng et al. combine two interlayer-antiferromagnetic chromium trihalides, CrI3 and CrCl3 in close proximity, and demonstrate ferromagnetic coupling between them.
- Guanghui Cheng
- , Mohammad Mushfiqur Rahman
- & Yong P. Chen
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Article
| Open AccessRoom-temperature valence transition in a strain-tuned perovskite oxide
Spin-state crossovers are phenomena where, under changes in temperature or pressure, the spin-state of an ion changes. In some materials, this spin-state crossover occurs simultaneously with a metal-insulator transition, driven by a valence transition. Control over such valence, spin-state, and metal-insulator transitions has much technological appeal, but, thus far, materials displaying this have been limited to cryogenic temperatures. Here, the authors show that in strained films of (Pr1-yYy)1- xCaxCoO3-δ, these transitions can be promoted to room temperature.
- Vipul Chaturvedi
- , Supriya Ghosh
- & Chris Leighton
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Article
| Open AccessFerromagnetic-antiferromagnetic coexisting ground state and exchange bias effects in MnBi4Te7 and MnBi6Te10
MnBi2Te4 and Bi2Te3 can form natural superlattices, where the MnBi2Te4 layers are separated by multiples of Bi2Te3. The combination of these two materials offers a potential platform for the interplay of tunable magnetism and topology. Here, the authors show that MnBi4Te7 and MnBi6Te10 display a complex magnetic ground state with coexisting ferromagnetic and antiferromagnetic domains.
- Xiaolong Xu
- , Shiqi Yang
- & Yu Ye
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Article
| Open AccessTheory of optical axion electrodynamics and application to the Kerr effect in topological antiferromagnets
Electromagnetic response of topological materials is described the so called axion electrodynamics which contains additional relations between the fields. Here the authors extend the theory of axion electrodynamics to general optical frequencies and apply it to a realistic topological antiferromagnet.
- Junyeong Ahn
- , Su-Yang Xu
- & Ashvin Vishwanath
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Article
| Open AccessGiant spin ensembles in waveguide magnonics
‘Giant atom’ physics occurs when the size of the atomic system becomes comparable to the wavelength of the light it interacts with. For atoms, such a regime is impossible to reach, however, for artificial atomic systems such ‘giant atom’ physics can be explored. Here, Wang et al demonstrate giant spin ensembles, consisting of magnetic spheres coupled to a microwave waveguide.
- Zi-Qi Wang
- , Yi-Pu Wang
- & J. Q. You
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Article
| Open AccessQuantum physics in connected worlds
Quantum simulators allow for experimental studies of many-body systems in complex geometries, which has rarely been addressed by theory. Here the authors study many-body Hamiltonians on generic random graphs and show that many-body effects emerge only in a small class of exceptional, highly structured graphs.
- Joseph Tindall
- , Amy Searle
- & Dieter Jaksch
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Article
| Open AccessEmergence of zero-field non-synthetic single and interchained antiferromagnetic skyrmions in thin films
An intrinsic antiferromagnetic skyrmion is located entirely within a single atomic layer, rather than two coupled layers. Here, the authors predict the existence of intrinsic antiferromagnetic skyrmions in a chromium monolayer deposited on a PdFe/Ir(111) substrate, which can form interlinked chain structures.
- Amal Aldarawsheh
- , Imara Lima Fernandes
- & Samir Lounis
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Article
| Open AccessCorrelation driven near-flat band Stoner excitations in a Kagome magnet
In flat band materials, the ’flat’ dispersion of the electronic states mean that interactions between electrons can be strong, potentially leading to a variety of interesting magnetic and transport properties. Here, Nag et al study the Kagomé semimetal Co3Sn2S2, and show a nearly flat Stoner excitation dispersion, a clear indication of spin-polarized and flat electronic bands.
- Abhishek Nag
- , Yiran Peng
- & Ke-Jin Zhou
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Article
| Open AccessCritical Offset Magnetic PArticle SpectroScopy for rapid and highly sensitive medical point-of-care diagnostics
Sensitive methods for antibody detection tend to be expensive and slow. Here, the authors report a magnetic particle spectroscopy method named COMPASS, as a rapid and low-cost technique which is comparable to ELISA in terms of sensitivity but with a measurement times of seconds.
- Patrick Vogel
- , Martin Andreas Rückert
- & Volker Christian Behr
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Article
| Open AccessBrownian reservoir computing realized using geometrically confined skyrmion dynamics
Magnetic skyrmions, due to their strongly nonlinearity and multiscale dynamics, are promising for implementing reservoir computing. Here, the authors experimentally demonstrate skyrmion-based spatially multiplexed reservoir computing able to perform Boolean Logic operations, using thermal and current driven dynamics of spin structures.
- Klaus Raab
- , Maarten A. Brems
- & Mathias Kläui
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| Open AccessEmergent many-body composite excitations of interacting spin-1/2 trimers
It was recently predicted that, in addition to well-known spinon excitations, a 1D spin-trimer chain with periodic exchange couplings hosts novel composite excitations. Bera et al. experimentally demonstrate and characterize such excitations, termed doublons and quartons, in a spin-trimer compound Na2Cu3Ge4O12.
- Anup Kumar Bera
- , S. M. Yusuf
- & Sergei A. Zvyagin
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Article
| Open AccessThree-dimensional skyrmionic cocoons in magnetic multilayers
Three dimensional topological spin textures, such as hopfions and skyrmion tubes, have seen a surge of interest for their potential technological applications. They offer greater flexibility than their two dimensional counterparts, but have been hampered by the limited material platforms. Here, Grelier et al. look at aperiodic multilayers, and observe a three dimensional skyrmionic cocoon.
- Matthieu Grelier
- , Florian Godel
- & Nicolas Reyren
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Article
| Open AccessFlexomagnetism and vertically graded Néel temperature of antiferromagnetic Cr2O3 thin films
Flexomagnetism refers to the modification of the magnetic properties of a material due to inhomogeneous strain, and offers a promising pathway to the control and manipulation of magnetism. Here, Makushko et al. explore flexomagnetism in antiferromagnetic thin films of Cr2O3, demonstrating a gradient of the Néel temperature as a result of an inhomogeneous strain.
- Pavlo Makushko
- , Tobias Kosub
- & Denys Makarov
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Article
| Open AccessPolarization-controlled tunable directional spin-driven photocurrents in a magnetic metamaterial with threefold rotational symmetry
By carefully structuring and patterning a material, it is possible to introduce emergent properties that would otherwise not exist. These metamaterials have allowed the development of a wide variety of new optical properties. Here, Matsubara et al present a magnetic metamaterial, where spin-currents can be directed by tuning the polarization of the incident light.
- Masakazu Matsubara
- , Takatsugu Kobayashi
- & Takeshi Kato
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Article
| Open AccessGiant stress response of terahertz magnons in a spin-orbit Mott insulator
There has been significant interest in using spin-waves or magnons for information processing, due to their low energy dissipation and short wavelength at terahertz frequencies, however, manipulating magnons can be challenging. Here, Kim et al show that magnons in Sr2IrO4 are extremely strain sensitive, with small applied strains leading to large variation in the magnon energy.
- Hun-Ho Kim
- , Kentaro Ueda
- & Matteo Minola
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Article
| Open AccessDynamical criticality of spin-shear coupling in van der Waals antiferromagnets
Van der Waals materials are characterized by two dimensional layers weakly held together by interlayer van der Waals forces. Here, the authors study how shear motions between these layers influence the magnetic properties of the van der Waals antiferromagnets FePS3, MnPS3, and NiPS3. ‘
- Faran Zhou
- , Kyle Hwangbo
- & Haidan Wen
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Article
| Open AccessSpin-orbital Yu-Shiba-Rusinov states in single Kondo molecular magnet
Yu-Shiba-Rusinov (YSR) states result from the exchange coupling between a localized magnetic moment and a superconductor. Traditionally, the YSR states have been studied for magnetic atoms. For molecular magnets with extended ligand spin, the entanglement of spin and ligand orbital gives rise to new forms of YSR excitations. Here, Xia et al uncovered spin-orbital YSR states in an unpaired ligand spin in the molecular magnet Tb2Pc3 on Pb.
- Hui-Nan Xia
- , Emi Minamitani
- & Ying-Shuang Fu
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Article
| Open AccessDimensional reduction and incommensurate dynamic correlations in the \(S=\frac{1}{2}\) triangular-lattice antiferromagnet Ca3ReO5Cl2
Frustration-induced dimensional reduction is manifested in lower dimensionality of magnetic correlations compared to that of the magnetic structure. Here the authors demonstrate the role of the uniform Dzyaloshinskii-Moriya interaction in the recently synthesized material Ca3ReO5Cl2 exhibiting dimensional reduction.
- S. A. Zvyagin
- , A. N. Ponomaryov
- & K. Kindo
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Article
| Open AccessBaby skyrmions in Chern ferromagnets and topological mechanism for spin-polaron formation in twisted bilayer graphene
In conventional materials, charge carriers are electron-like quasiparticles, but topological bands allow for more exotic possibilities. Here, the authors predict that in the Chern-ferromagnet phase of twisted bilayer graphene charge is carried by spin polarons, bound states of an electron and a spin flip.
- Eslam Khalaf
- & Ashvin Vishwanath
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Article
| Open AccessKondo quasiparticle dynamics observed by resonant inelastic x-ray scattering
The fate of high-energy degrees of freedom, such as spin-orbit interactions, in the coherent state of Kondo lattice materials remains unclear. Here, the authors use resonant inelastic x-ray scattering in CePd3 to show how Kondo-quasiparticle excitations are renormalized and develop a pronounced momentum dependence, while maintaining a largely unchanged spin-orbit gap.
- M. C. Rahn
- , K. Kummer
- & M. Janoschek
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Article
| Open AccessAnisotropic long-range spin transport in canted antiferromagnetic orthoferrite YFeO3
Antiferromagnets have attracted interest for spin-based information processing due to their resilience to stray magnetic fields and extremely rapid spin dynamics, however, long range spin wave transport has only been shown in one type of antiferromagnet thus far. Here, Das et al demonstrate long range spin wave transport in antiferromagnetic YFeO3.
- Shubhankar Das
- , A. Ross
- & M. Kläui
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Article
| Open AccessInter-valley coherent order and isospin fluctuation mediated superconductivity in rhombohedral trilayer graphene
Trilayer graphene was recently shown to exhibit superconductivity without a Moire pattern that had proved important in tuning superconductivity in bilayer graphene. Here, the authors explore correlated metallic phases and the pairing mechanism of superconductivity in trilayer graphene, and show that intervalley coherent fluctuations can act as a pairing glue, giving rise to chiral unconventional superconductivity.
- Shubhayu Chatterjee
- , Taige Wang
- & Michael P. Zaletel
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Article
| Open AccessChirality flips of skyrmion bubbles
Skyrmion bubbles consist of a centre magnetization pointing up or down, and a swirling vortex magnetic texture, either clockwise or anticlockwise around this. Here, Yao et al use a three-dimensional imaging approach to study this magnetic texture, and show that while the in-plane vortex-like texture changes easily, the centre magnetic direction, the polarity, is retained, leading to a reversed chirality.
- Yuan Yao
- , Bei Ding
- & Wenhong Wang
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Article
| Open AccessGiant g-factors and fully spin-polarized states in metamorphic short-period InAsSb/InSb superlattices
Semiconductors with large Landé g-factors allow for both highly spin-polarized states, and precise control of the spin dynamics. Here, the authors make superlattices of two semiconductors, InSb, and InAsSb, and by tuning the conduction and valence band overlap, achieve a Landé g-factor of 104.
- Yuxuan Jiang
- , Maksim Ermolaev
- & Sergey Suchalkin
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Article
| Open AccessUniformly aligned flexible magnetic films from bacterial nanocelluloses for fast actuating optical materials
Naturally derived biopolymers attracted great interest to construct photonic materials but traditional processing commonly results in non-uniform organization across largescale areas. Here, the authors report a uniform biophotonic organization of cellulose nanocrystals decorated with superparamagnetic nanoparticles enabling transformation from helicoidal cholesteric to uniaxial nematic phase with near-perfect orientation.
- Xiaofang Zhang
- , Saewon Kang
- & Vladimir V. Tsukruk
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Article
| Open AccessQuantum wake dynamics in Heisenberg antiferromagnetic chains
It has long been suggested that the inverse Fourier transform of neutron scattering data gives access to space- and time-resolved spin-spin correlations. Scheie et al. perform this procedure on high-precision experimental data from a 1D quantum antiferromagnet and uncover new features in short-term quench dynamics.
- A. Scheie
- , P. Laurell
- & D. A. Tennant
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Article
| Open AccessNano-scale collinear multi-Q states driven by higher-order interactions
Multi-Q states are 2D typically non-collinear spin textures that can be stabilized at the nanoscale and at zero magnetic field by interactions between multiple spins. Gutzeit et al. uncover a variety of multi-Q states in Fe/Rh atomic bilayers on the Ir(111) surface, including unexpected 2D collinear states.
- Mara Gutzeit
- , André Kubetzka
- & Kirsten von Bergmann
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Article
| Open AccessFrom an antiferromagnetic insulator to a strongly correlated metal in square-lattice MCl2(pyrazine)2 coordination solids
Achieving high conductivity in metal-organic solids can be challenging, due to the difficulty of obtaining a good overlap between the d-orbitals of the metal and the π-orbitals of the organic molecule. Here, the authors present two coordination solids, VCl2(pyrazine)2 and TiCl2(pyrazine)2, with remarkably different electrical conductivity. While the former is an insulator, the latter displays the highest conductivity of any octahedrally coordinated metal ions based metal-organic solid.
- Panagiota Perlepe
- , Itziar Oyarzabal
- & Rodolphe Clérac
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Article
| Open AccessMagnetization switching in polycrystalline Mn3Sn thin film induced by self-generated spin-polarized current
Under an applied current, chiral antiferromagnets, such as Mn3Sn, can produce a spin-polarized current. Here, by varying the thickness of a buffering layer, the authors show that this spin-polarized current can drive self-induced switching in polycrystalline Mn3Sn.
- Hang Xie
- , Xin Chen
- & Yihong Wu
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Article
| Open AccessGiant spin-to-charge conversion at an all-epitaxial single-crystal-oxide Rashba interface with a strongly correlated metal interlayer
The interface between perovskite-oxide SrTiO3 and other oxides realizes efficient spin-to-charge current conversion; however, the typically insulating oxides hinder the propagation of spin-currents. Here the authors achieve a record efficiency by replacing an oxide insulator with a strongly-correlated polar metal.
- Shingo Kaneta-Takada
- , Miho Kitamura
- & Shinobu Ohya
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Article
| Open AccessObservation of spin-glass-like characteristics in ferrimagnetic TbCo through energy-level-selective approach
In a ferrimagnet, there are two magnetic sublattices coupled antiferromagnetically. The dynamics of the two magnetic sublattices isn’t well understood, as the magnetic moments for each reside at different energy levels. Here, Park et al show that the magnetic moments at deeper energy levels show spin-glass like characteristics.
- Ji-Ho Park
- , Won Tae Kim
- & Kab-Jin Kim
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Article
| Open AccessControl of structure and spin texture in the van der Waals layered magnet CrSBr
Van der Waals magnetic materials are composed of atomically thin magnetically ordered layers stacked together. Here, aiming to control magnetism locally, Klein et al use an electron beam to create small regions where van der Waals layers are orientated perpendicular to the rest of the sample.
- J. Klein
- , T. Pham
- & F. M. Ross
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Article
| Open AccessSpontaneous spin-valley polarization in NbSe2 at a van der Waals interface
Van der Waals heterostructures made of 2D materials offer a rich platform for the study of novel proximity effects. Here, by means of Hall effect measurements, the authors show a proximity-induced ferromagnetic/ferrovalley ground state with spontaneous spin-valley polarization in a V5Se8/NbSe2 heterostructure.
- Hideki Matsuoka
- , Tetsuro Habe
- & Masaki Nakano